Question

Transfer this Active voice sentence to the Passive one: I suppose that Jeremy has written this letter.
1. I am supposed that Jeremy has written this letter.
2. This letter must have written by Jeremy.
3. This letter must have been written by Jeremy.
4. I suppose that Jeremy has been written this letter.

Answer 1

This letter must have been written by Jeremy.

Answer 2

3.This letter must be written by Jeremy